Free Online Calculators for Everyday Life

Fast, accurate, and easy-to-use calculators for finance, math, health, fitness, and everyday calculations.

Popular:Mortgage Calculator BMI Calculator Age Calculator Percentage Calculator Loan Calculator Calorie Calculator

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Open the full scientific calculator with history

Popular calculators

The tools people use most, from mortgage payments to body mass index.

Mortgage CalculatorMonthly payment with taxes, insurance, PMI and a full amortization schedule.BMI CalculatorBody mass index with WHO category and healthy weight range.Age CalculatorExact age in years, months and days from a birth date.Percentage CalculatorX% of Y, percent change, difference and more.Loan CalculatorMonthly payment, total interest and repayment schedule for any fixed-rate loan.Calorie CalculatorDaily calories to maintain, lose or gain weight.Scientific CalculatorTrig, logs, exponents, factorials, memory and history.Compound Interest CalculatorGrow savings with any compounding frequency and monthly contributions.Salary CalculatorConvert hourly, weekly, monthly and annual pay.Date CalculatorAdd or subtract days, weeks, months and years.

Browse by category

Hundreds of formulas, organized so you can find the right tool quickly.

Financial Calculators30 calculators

Mortgage, loan, interest, investment, retirement, tax and budgeting calculators with amortization schedules and charts.

Math Calculators24 calculators

Scientific, percentage, fraction, statistics, algebra and geometry calculators with step-by-step explanations.

Health & Fitness Calculators16 calculators

BMI, calorie, BMR, TDEE, body fat, macro, pregnancy and fitness calculators in metric and imperial units.

Date & Time Calculators11 calculators

Calculate age, days between dates, business days, time durations, time zones and countdowns.

Education Calculators7 calculators

GPA, grade, final grade, weighted grade, test score and student loan calculators for students and teachers.

Construction & Engineering Calculators14 calculators

Concrete, square footage, roofing, tile, paint, stair, electrical, voltage drop and Ohm's law calculators.

Unit Converters12 calculators

Convert length, weight, temperature, area, volume, speed, time, data, energy, pressure, power and currency.

Everyday Calculators13 calculators

Tip, discount, sales tax, fuel cost, gas mileage, shoe size, Roman numeral, password and random number tools.

Recently added

Matrix CalculatorMultiply, invert, determinant, rank and more.Currency ConverterDaily ECB reference exchange rates.Debt Payoff CalculatorSnowball or avalanche plan for multiple debts.Rent vs. Buy CalculatorCompare net worth from buying a home versus renting.Income Tax CalculatorUS federal (2025/2026) and UK (2025/26) income tax with brackets.Take-Home Paycheck CalculatorUS paycheck after federal tax, FICA, state tax and 401(k).

Why use these calculators?

Private by design

Calculations run in your browser. We never send or store the numbers you enter.

Accurate and transparent

Every calculator explains its formula, assumptions and limitations, with worked examples.

Free, no sign-up

Every tool is free to use without an account, on any device.